Device for stretching the selvedge threads on looms



Dec; 23, 1947.

R. v DEWAS DEVICE FOR STRETCHING THE 'SELYEDGE THREADS ON LOOMS Filed May 18, 1945 2 Sheets-Sheet l I l 1 oeooooo/o INVENTOR: Raymond Dcwas as Jan-:44 '1,-

ATTO uvsss Dec. 23, 1947.v w s 2,433,101

DEVICE FOR STRETCHING THE SELVEDGE THREADS ON LOOMS Filed May 18, 1945 2 Sheets-Sheet 2 Raymond DewcLs ..ATTO ansss V Patented Dec. 23, 194:7

DEVIGEFQR STRETCHING- THE SEEV'EDGE" THREADS ON LOOMS R ymond-.Dewas; Ami ns, France.-

Application May-18, 1945; Serial No; 594-3817 In FranceDecemberZQ; 1944 6 Claims. 1

'llhisinvention. chiefly relates todooms: andmore particularly to. looms; having a. continuous; weft supply and: in which. the. weft, suppliediby: large fixed bobbins; is inserted. into the shed: by means ofi inserting members having no cop...

In the. manufacture oi. cloth. fabric, a tightly woven edge, or selvage is formed on each. Side of the, material to prevent the. warp threads. of the material itself from unraveling: until; it. is used. Present methods for controlling. the: tens sioniof; the warpthreads have beenpgenerally une satisfactory" because. one or? more of the threads may slachen, in the course of weaving, and cause defects to occur in the fabric.

Present methods for: adjusting the. tension. of warp threads for the selvage such. as the-provision oi breakingmeans. for the bobbinsor: the groupingof the threads in a suitable hook. and weight as. sembiy,. have proven unsatisfactory because, in thesfirstinstance it was'diificult toobtain uniform tension on. all the threads, and in the; second in! stance. they became seriously entangled.

lfhe object of this inventionv is to remedy the aforementioned dificultieaby theemployment' of a; device that; will. provide uniform tension for all of. the warp thread's of the selvage and in additioh will prevent the entanglement thereof;

According to one formofthe invention: a heavy container; having. an open top and adapted to receive weights of various sizes is provided with a series of spaced openings near thetop edge of two; parallel sides. The selvage threads are looped; first thru the series of holes in one side, then over a fixed support and lastly thru the holes ontheremaini'ng side. By this-procedure; the: salvagev threads remain separated to avoid tangling, and the box travels downwardly as the slack, producedby keeping the threads constantly under tension, is accumulated.

Another form of the invention comprises the employment of thread guides before and: after the weighing device to separatethe; threads be.- fore being looped. thru the holesintheweighting device and then to reassemble the threads before they? take their place beside the warp threads iorrning thepfabric itself.

It shouldhe notedthat. in normal weaving operations, the warpthreads forming the fabric itself are not subjected to the great degree of ten.- sionreduired of the selvage threads.

i'he characteristic features of this invention will bebetter-understood'in the course ofthe following description When taken in connection with the accompanying drawings, by way of example only, of preferred embodiments of the inventive idea.

In said drawings, which relate to a stretching device for one of the selvedges:

Fig. l is an elevational end View of the warp beam showing the manner in which the selvedge threads. behind the: loom, are submitted to. the action of f the: stretching device.

Fig; 2-;is an elevationalfrontview of the heavy weighting container suspended. to the selvedge threads.

Fig; 3: is: a sectional. view of saidl container through the; line (lie-.3: of Fig. 2;

Fig; I at View similar to Fig; 2: showing a modification of the container.

Fig; 5:. is a front elevational view: of the pres separating. guide;

Fig; 6a is aplane. view of said preseparati'ng guide seen. from. above.

is a front elevational view of the re.- assembling: guide; of which:

Fig, ails-x a plane view; seen from. above.

Fig; 9. is: a front elevational view of" another form: of a. container, of. which Fig. 10 is an end view.

In said figures; I is the roller orbeam from which the warp threads 2 are unwound which, after their passage on a first bar 4, pass-round" a second bar 5* wherethe warp sheet is separated and divided into two parts-ofwhichone; 2a, comprises the selved'ge threads which are looped through thestretching-or weighting device, while the. other, 26; comprises all. the other warp threads'going directly'to therbackrest' 6 and. then to the droppers T of the warp stop motiontwhere the selvedge threads 2a talge. their place back again side by side with hem, ll warp P ssin then throug'hthe healds. (not. shown).

- 'Ilhe. stretching device comprises a.v U.-shaped containers formedior instance oi a folded metal sheet the. sides. 80.. and 8b of which: are provided nihein unner- Part with opening formed. holes 9 suitably spaced from. one another and through each of which passes one of the selvedge threads 2c: (the number oil which lSi supposed: to: be: eight in the example shown) The bottom; offthebasket is. urevided with cut. out parts which; are turned up and: on. which; the;- desired number. of adjusting-weights; lmiszfitted (Fig; 1); As=s-hown the: drawing; the: side 8a canbe li'ghtened by being provided with an opening 20 for compensating the: slight pivoting effect resulting from the passageof the threads through the basket.

In combination with the contai'ner it, the device oomprisesrods M, ii and'ls-securedon'a support fast with the frame of the loom, said threads passing round the-rod H and going down in order to pass through the holes 9 of the side 8a of the container, whereafter they move upward again in order to pass on the rod I2, go down again and pass through the holes 9 on the side of 8b of the container and move upward again, pass on the rod I3 and go to the warp stop motion droppers l and from the latter to the healds. This zigzag travel of the threads 2a makes it possible to accommodate a greater length of thread and to provide more uniform tension. I

Before the container 8, the device can comprise a preseparating guide formed of a small bar It provided with holes I through which the threads pass, said bar being advantageouslycarried by an arm Ma ending in a socket I6 mounted on the rod I I.

Near the outlet, the device comprises a reassembling guide I1 provided with a notch I8 for recollecting the threads 2a in order to unite them in a group again, said guide being advantageously carried by an arm I'Ia ending in a socket I9 mounted on the rod II, preferably on the side opposed, with respect to the selvedge threads passing round said rod, to that which is occupied by the socket IB. Since the bar I4 and the guide H are secured on the rod II by means of their sockets I6 and I9 respectively, it is possible to obtain all the required positions.

The device being formed in this manner, it is apparent that, as the weaving operation pr0- gresses elongation of the selvedge threads because of the tension under which they are placed is compensated by the progressive downward travel of the container 8. As soon as the container 8 comes near the ground, the work-woman stops the loom, seizes the selvedge threads 2a in that part between the reed and the fell of the cloth and pulls on them in order to raise the basket again. She then cuts the excess of length of the threads which have been thus pulled, making a knot in front of the fell of the cloth and starts the loom again.

Of course, the invention is by no way limited to the particular form described since it is possible to modify the details and also use equivalent means without departing from the scope and spirit of the invention.

For instance, in order to avoid the necessity of threading in the threads, the holes 9 provided in the sides of the container 8 may be advantageously replaced by notches 2 I, as shown in Figure 4; in this case, the small guide bar I4 is also provided with notches.

In order to facilitate the shifting of the threads, the holes 9 or the notches 2| of the container 8 can be provided with rounded parts; likewise the rods II, I2 and I3 can be substituted by rollers freely rotating about fixed axes on one of which the sockets I6 and I 9 are wedged.

The rods, I I, I 2 and I3 can be formed of channeled rollers, each channel receiving a selvedge thread.

If desired, the rod II can be replaced by the tainer, can offer the most varied forms and be formed either of a folded metal sheet, as shown,

or of a shaped rod, or of an assembly of flat or 4 sectional irons, or by a moulded piece of plastic material and the like.

It can also be formed of channeled rollers 22, as shown in Figures 9 and 10, mounted on a common support 23 and provided with one or more spindles 24 for receiving the weights I0; said rollers can also be independent of one another. Said container formed of rollers can itself receive the most varied forms.

I claim:

1. A device for stretching selvedge threads, principally on looms and more particularly on looms provided with a continuous supply of the weft through large fixed bobbins, the weft thread being inserted by means of inserting members having no cop, said device comprising a container adapted to receive weights of various sizes, and openings-in said container through which said selvedge threads pass to suspend said container whereby the said threads are maintained under uniform tensions and spaced from one another.

2. A device for stretching selvedge threads comprising a, container, and openings in said container spaced from one another and through each of which passes one of the selvedge threads in order to insure the suspension of the said container which is arranged to receive removable masses for modifying its weight.

3. A device according to claim 1 wherein the container comprises one or more rollers provided with channels each of which is engaged by one of the selvedge threads.

4. A stretching device according to claim 1, comprising, in combination with the container, reversin guides which permit of tackling the selvedge threads so as to impose on them a zigzag travel during which they pass several times through the said container.

5. A device according to claim 1, comprising in combination with the container, a reassembling guide arranged behind said container on the travel of the selvedge threads whereby the said threads are brought closer to one another before they take their place back again by the side of the other warp threads.

6. A device according to claim 1, comprising, in combination with the container, a preseparating guide arranged before said container and adapted for spacing the selvedge threads from one another before they pass through the said container.

RAYMOND DEWAS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 347,028 Dalton Aug. 10, 1886 658,341 Cartier Sept. 25, 1900 FOREIGN PATENTS Number Country Date 87,032 Switzerland Nov. 1, 1920 232,727 Great Britain Apr. 30, 1925 

